Resid Cracking Catalysts

Tu, Shiying; Chen, Zubi; Fan, Zhongbi

doi:10.1021/bk-1994-0571.ch023

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A simple calculation shows that, at a 12-s reaction time, the standard operation (single injection, regenerated catalyst) forms about 8% less coke than the mode with two injections. In general terms, this additional coke with multiple injections should not represent a problem for the operation of FCC units; however, present technology is able to manage high coke production, such as that found in residue cracking, 22 with different solutions. Moreover, it has to be considered that the test reactant used in step III in these experiments has a very low coking trend and, consequently, the impact of the coke formed by the recycle stream in the first injection is undoubtedly more important.…”

Section: Resultsmentioning

confidence: 99%

Recycling of Low-Value Hydrocarbon Cuts by Means of Multiple Injections to FCC Units

Tiscornia

Puente

Sedrán

2002

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The upgrading of a visbreaker naphtha by recycling it into an FCC unit was studied following the approach of multiple injections (with the naphtha in the first one) using a laboratory riser simulator reactor and an equilibrated catalyst. The experimental work comprised three different stages: a study of the crackability of the naphtha under conventional FCC conditions (500−550 °C, CATOIL 6.1, short contact times), a study of the conversion of the naphtha under a regime of high severity (CATOIL 37), and a study of the impact of this injection on the overall FCC operation. Heavy C7−C9 olefins and n-paraffins are converted, and aromatics and C4−C6 i-paraffins are the most noticeable products. Even though the RON in the gasoline cut of the products does not change, modifications in the composition are advantageous because heavy olefins and n-paraffins are selectively converted. The high-severity regime induces more profound changes in the composition of the gasoline cut that significantly improve the blending properties. More importantly, the first injection would not interfere with the standard feedstock injection, because catalyst properties and performance are not altered, as shown by experiments with coked and regenerated catalyst.

show abstract

Section: Resultsmentioning

confidence: 99%

Recycling of Low-Value Hydrocarbon Cuts by Means of Multiple Injections to FCC Units

Tiscornia

Puente

Sedrán

2002

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…In this way, the co-processing of plastic wastes would not alter significantly the coke yields and, consequently, the delicate and self-sustained heat balance in FCC. Furthermore, if needed, it should be considered that technical solutions exist to handle high coke yields such as those seen in resid FCC [63].…”

Section: Cokementioning

confidence: 99%